Coil Rail - 4.0L: Removal

A one-piece coil rail assembly containing three individual coils is used on the 4.0L engine. See Fig 1. The coil rail must be replaced as one assembly. The bottom of the coil is equipped with 6 individual rubber boots to seal the 6 spark plugs to the coil. Inside each rubber boot is a spring. The spring is used for an electrical contact between the coil and the top of the spark plug. These rubber boots and springs are a permanent part of the coil and are not serviced separately. See Fig 1.

1. Disconnect negative battery cable at battery.
2. The coil is bolted directly to the cylinder head. Remove 4 coil mounting bolts. See Fig 2.
3. Carefully pry up coil assembly from spark plugs. Do this by prying alternately at each end of coil until rubber boots have disengaged from all spark plugs. If boots will not release from spark plugs, use a commercially available spark plug boot removal tool. Twist and loosen a few boots from a few spark plugs to help remove coil.
4. After coil has cleared spark plugs, position coil for access to primary electrical connector. Disconnect connector from coil by pushing slide tab outwards to right side of vehicle. See Fig 3. After slide tab has been positioned outwards, push in on secondary release lock on side of connector and pull connector from coil. See Fig 3.
5. Remove coil from vehicle.

Fig 1: Ignition Coil Assembly-4.0L 6-Cylinder Engine

Courtesy of DAIMLERCHRYSLER CORP.

Fig 2: Ignition Coil Rail Location-4.0L 6-Cylinder Engine

Courtesy of DAIMLERCHRYSLER CORP.

Fig 3: Ignition Coil Electrical Connector-4.0L 6-Cylinder Engine

Courtesy of DAIMLERCHRYSLER CORP.